TECHNICAL GUIDE | Cal. 5J32A |
III.VALUE CHECKING AND ADJUSTMENT
●Coil block resistance
Second coil block : 2.00 KΩ | ~ 2.45 KΩ | |
Hour and minute coil block : |
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Coil for driving hands | : | 1.00 KΩ ~ 1.20 KΩ |
Coil for detecting generation : | 280 Ω ~ 360 Ω | |
Note: Measure the coil block resistance after installing each coil block to the movement, checking that stable measurements may be obtained.
*The motor driving the hour and minute hands uses a special driving system so that they move quickly to indicate the current time immediately after the time relay function is activated. The hour and minute coil block has two layers of coils, one for driving hands and the other for detecting generation, and it is necessary to measure the resistance of each layer of coil.
•The illustration below shows the patterns to which the probes of the tester should be applied to measure the resistance of the respective coils.
Patterns for checking | A | a | |
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the coil for driving hands |
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B | b | ||
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Patterns for checking
the coil for detecting generation
●Checking for leakage between coil for driving hands and coil for detecting generation
*If the hour and minute hands do not move properly when the time relay function is activated, that is, if they remain stopped or will not move smoothly, check for the leakage between coil for driving hands and coil for detecting generation. This checking is required only if such a problem is found.
If leakage is detected, replace the hour and minute coil block with a new one.
How to check the leakage
1.Make the tester ready for measuring the resistance.
2.Apply the probes of the tester to 1 “A” and “a”, 2 “A” and “b”, 3 “B” and “a”, and 4 “B” and “b”, respectively, to measure the resistance.
3.If the four measurements obtained are all infinitely great, that is, if the resistance was unable to be
measured for all the four cases, there is no leakage between coil for driving hands and coil for detecting generation. As a guideline, there is a leakage if measurements of less than 2 KΩ were obtained.
●Generating coil block resistance
340 Ω ~ 440 Ω
Note: Measure the generating coil block resistance after installing it to the movement, checking that stable measurements are obtained.
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